Case with Wildcards

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Case with Wildcards

TJT

SSCommitted

Points: 1926
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May 15, 2013 at 3:31 pm

#277543

I am having trouble with a CASE statement like this.
The All Cars doesn't work.
SELECT
CASE
WHEN CARS.Model LIKE '%Ford%' THEN 'Ford'
WHEN CARS.Model LIKE '%Chev%' THEN 'Chev'
WHEN CARS.Model LIKE '%Buick%' THEN 'Buick'
WHEN CARS.Model LIKE '%' THEN 'All Cars'
END AS 'Models'

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Lowell SSC Guru Points: 323518 More actions · Answer 1

the last selection should just be an ELSE;

SELECT

CASE

WHEN CARS.Model LIKE '%Ford%' THEN 'Ford'

WHEN CARS.Model LIKE '%Chev%' THEN 'Chev'

WHEN CARS.Model LIKE '%Buick%' THEN 'Buick'

ELSE 'All Cars'

END AS 'Models'

Lowell

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TJT SSCommitted Points: 1926 More actions · Answer 2

TJT

SSCommitted

Points: 1926

May 15, 2013 at 6:00 pm

#1615589

The ELSE statement is not returning all models

writearjun53 Ten Centuries Points: 1060 More actions · Answer 3

if you want all remaining model as it is then please try this query

SELECT

CASE

WHEN CARS.Model LIKE '%Ford%' THEN 'Ford'

WHEN CARS.Model LIKE '%Chev%' THEN 'Chev'

WHEN CARS.Model LIKE '%Buick%' THEN 'Buick'

ELSE CARS.Model

END AS 'Models'

FROM CARS

HanShi SSC-Dedicated Points: 33507 More actions · Answer 4

Remember: if within a CASE statement the WHEN clause is TRUE, the following WHEN statements and the ELSE statement is not executed anymore.

So if some data in your example contains the value "fictive Buick Chevron" it will return "Chev" and not "Buick". Only when the data doesn't contain either "Ford" nor "Chev" nor "Buick" it will return the "All Cars" value.

** Don't mistake the ‘stupidity of the crowd’ for the ‘wisdom of the group’! **

TJT SSCommitted Points: 1926 More actions · Answer 5

I guess I have phrased my question wrong.

What I was wondering is if it is possible to use a CASE statement to return BUICK, CHEV, and then All Models (including BUICK and CHEV)

Eugene Elutin SSC Guru Points: 59322 More actions · Answer 6

Yes, you can. In another column:

SELECT CASE

WHEN CARS.Model LIKE '%Ford%' THEN 'Ford'

WHEN CARS.Model LIKE '%Chev%' THEN 'Chev'

WHEN CARS.Model LIKE '%Buick%' THEN 'Buick'

WHEN CARS.Model LIKE '%' THEN 'All Cars'

END AS Models

,CARS.Model

FROM yourtable

or in the same column using union:

SELECT CASE

WHEN CARS.Model LIKE '%Ford%' THEN 'Ford'

WHEN CARS.Model LIKE '%Chev%' THEN 'Chev'

WHEN CARS.Model LIKE '%Buick%' THEN 'Buick'

WHEN CARS.Model LIKE '%' THEN 'All Cars'

END AS Models

FROM yourtable

UNION

SELECT CARS.Model

FROM yourtable

One more thing: do not use single quotes around column name aliases. If you really want to enclose them in something - use square brackets, otherwise you can misread them for literal strings.:

AS 'Models' - bad

AS [Models] - good

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dotedebonair Newbie Points: 3 More actions · Answer 7

If the value "fictive Buick Chevron" is present in your example, it will return "Chev" rather than "Buick". It only returns "All Cars" if the data does not contain either "Ford" nor "Chev" nor Buick. When reading a second row from an unnested cursor, it returns -1, which is what we expect it to do here. Alternatively, may the nested cursor be utilized to run the first procedure? Any ideas you have would be greatly appreciated.

octordle